3. Protective casingThe interior sheet metal case of the (P) IDR drum heater that protects the radiator elements from the drum has a special black coating for proper heat reflection.

4. InsulationThe double-walled case of the (P) IDR can be opened up, and is insulated with mineral wool and reflector foil facing outward. The drum is completely contained by the floor heater, lid and walls of the drum heater.

5. Floor heaterThe BDR floor heater onsists of a circular heating plate on which the drum sits hermetically. A thermostat and a covered limit control "n. ICE 519" for unsupervised operation are fitted to the bottom of the insulated casing.